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CVE-2021-47248

7.8 · HIGH

In the Linux kernel, the following vulnerability has been resolved: udp: fix race between close() and udp_abort() Kaustubh reported and diagnosed a panic in udp_lib_lookup().

Published May 21, 2024CWE-362EPSS 0.19%

Overview

CVE-2021-47248 is a high-severity vulnerability. It was published on May 21, 2024 and has a CVSS 3.1 base score of 7.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical description

In the Linux kernel, the following vulnerability has been resolved:

udp: fix race between close() and udp_abort()

Kaustubh reported and diagnosed a panic in udp_lib_lookup().

The root cause is udp_abort() racing with close(). Both

racing functions acquire the socket lock, but udp{v6}_destroy_sock()

release it before performing destructive actions.

We can't easily extend the socket lock scope to avoid the race,

instead use the SOCK_DEAD flag to prevent udp_abort from doing

any action when the critical race happens.

Diagnosed-and-tested-by: Kaustubh Pandey <[email protected]>

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refgit.kernel.org/stable/c/2f73448041bd0682d4b552cfd314ace66107f1adRefgit.kernel.org/stable/c/5a88477c1c85e4baa51e91f2d40f2166235daa56Refgit.kernel.org/stable/c/65310b0aff86980a011c7c7bfa487a333d4ca241Refgit.kernel.org/stable/c/8729ec8a2238152a4afc212a331a6cd2c61aeeacRefgit.kernel.org/stable/c/a0882f68f54f7a8b6308261acee9bd4faab5a69eRefgit.kernel.org/stable/c/a8b897c7bcd47f4147d066e22cc01d1026d7640eRefgit.kernel.org/stable/c/e3c36c773aed0fef8b1d3d555b43393ec564400fRefgit.kernel.org/stable/c/2f73448041bd0682d4b552cfd314ace66107f1adRefgit.kernel.org/stable/c/5a88477c1c85e4baa51e91f2d40f2166235daa56Refgit.kernel.org/stable/c/65310b0aff86980a011c7c7bfa487a333d4ca241

How CyberStrike helps

Frequently asked questions

What is CVE-2021-47248?

CVE-2021-47248 is a high-severity vulnerability. It was published on May 21, 2024 and has a CVSS 3.1 base score of 7.8 (HIGH).

How severe is CVE-2021-47248?

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2021-47248?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2021-47248?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-47248 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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